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#include <QtGui/QLabel>
#include <QtGui/QAction>
#include <QtGui/QHBoxLayout>
#include <QtGui/QMessageBox>
#include <QtGui/QMenu>
#include <QtGui/QFileDialog>
#include <QtGui/QContextMenuEvent>
#include <QtGui/QPushButton>
#include <QtGui/QTableView>
#include <QtGui/QHeaderView>
#include <QtGui/QScrollBar>
#include <QDebug>

#include "featureclassificationpage.h"
#include "featureclassificationmodel.h"
#include "imageview.h"
#include "backgroundtaskwatcher.h"
#include "common.h"

FeatureClassificationPage::FeatureClassificationPage(FeatureClassificationModel &model, QWidget *parent) :
    QWizardPage(parent),
    _model(model)
{
    setTitle(tr("Feature classification"));
    setSubTitle(tr("Index areas in provided image."
                   "Indexed areas are filled with different collor")); // TODO

    createActions();

    _indexView = new ImageView(FeatureClassificationModel::EIndexedAreasImage);
    _indexView->setToolTip(tr("Indexed areas"));
    _indexView->setModel(&(_model.imageModel()));

    QPushButton *featureClassificationButton = new QPushButton();
    featureClassificationButton->setText(tr("Classificate"));
    featureClassificationButton->setToolTip(tr("Feature classification"));

    QObject::connect(featureClassificationButton, SIGNAL(clicked()), this, SLOT(featureClassification()));

    QVBoxLayout *indexLayout = new QVBoxLayout;
    indexLayout->addWidget(_indexView);
    indexLayout->addWidget(featureClassificationButton);

    QTableView *featuresView = new QTableView;
    featuresView->setModel(&(_model.model()));
    featuresView->horizontalHeader()->setResizeMode(QHeaderView::ResizeToContents);
    featuresView->verticalHeader()->setResizeMode(QHeaderView::ResizeToContents);
    featuresView->setIconSize(QSize(50, 50)); // TODO

    QHBoxLayout *featureClassificationLayout = new QHBoxLayout;
    featureClassificationLayout->addLayout(indexLayout);
    featureClassificationLayout->addWidget(featuresView);
    featureClassificationLayout->setStretch(0, 1);
    featureClassificationLayout->setStretch(1, 2);

    QLabel *stepsLabel = new QLabel();
    stepsLabel->setText(tr("1. Feature classification"));
    stepsLabel->setAlignment(Qt::AlignLeft | Qt::AlignTop);
    stepsLabel->setWordWrap(true);

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(stepsLabel);
    layout->addLayout(featureClassificationLayout);
    layout->setStretch(0, 1);
    layout->setStretch(1, 4);
    this->setLayout(layout);
}

void FeatureClassificationPage::initializePage()
{

}

bool FeatureClassificationPage::validatePage()
{
    if (!_model.model().rowCount()) {
        featureClassification();
    }
    return true;
}

void FeatureClassificationPage::contextMenuEvent(QContextMenuEvent *event)
{
    QMenu menu(this);
    menu.addAction(featureClassificationAct);
    menu.addAction(aboutAct);
    menu.exec(event->globalPos());
}

void FeatureClassificationPage::featureClassification()
{
    qDebug() << "FeatureClassificationPage::featureClassification";
    FeatureClassificationTask *task = _model.featureClassification();
    if (task) {
        BackgroundTaskWatcher watcher(task, tr("Feature classification"));
        watcher.exec();
        emit TODO(_model.externalize());
    }
}

void FeatureClassificationPage::about()
{
    // TODO
    qDebug() << "FeatureClassificationPage::about";
    QMessageBox::about(this, tr("Area indexing"),
            tr("1. Area indexing."));
}

void FeatureClassificationPage::createActions()
{
    featureClassificationAct = new QAction(tr("&Indexing"), this);
    featureClassificationAct->setShortcuts(QKeySequence::Print);
    featureClassificationAct->setStatusTip(tr("Feature classification of indexed areas"));
    QObject::connect(featureClassificationAct, SIGNAL(triggered()),
                     this, SLOT(featureClassification()));

    aboutAct = new QAction(tr("&About"), this);
    aboutAct->setStatusTip(tr("Show the application's About box"));
    QObject::connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
}
